Wireless communications method, terminal device, and communications device

Abstract

A wireless communications method, a terminal device, and a communications device are provided. One example method includes: transmitting capability information; and receiving a first signal and a second signal that are sent by a first device, wherein the first signal and the second signal are used to determine first phase information that comprises a phase difference between the first signal and the second signal, a location at which the first device transmits the first signal is a first location, a location at which the first device transmits the second signal is a second location, and the first location is different from the second location, wherein the capability information indicates whether the first terminal device supports calculation of the phase difference between the first signal and the second signal.

What is claimed is: 
     
         1 . A wireless communications method, comprising:
 transmitting, by a first terminal device, capability information; and   receiving, by the first terminal device, a first signal and a second signal that are sent by a first device, wherein the first signal and the second signal are used to determine first phase information that comprises a phase difference between the first signal and the second signal, a location at which the first device transmits the first signal is a first location, a location at which the first device transmits the second signal is a second location, and the first location is different from the second location, wherein the capability information indicates whether the first terminal device supports calculation of the phase difference between the first signal and the second signal.   
     
     
         2 . The method according to  claim 1 , further comprising:
 receiving, by the first terminal device, first information, wherein the first information comprises one or more of the following:
 configuration information of the first signal and the second signal; 
 information indicating whether the first terminal device needs to calculate the phase difference between the first signal and the second signal; 
 information indicating whether signals sent by the first device support phase estimation for difference calculation; or 
 information indicating whether the first signal and the second signal support phase estimation for difference calculation. 
   
     
     
         3 . The method according to  claim 2 , wherein the first information comprises information indicating one or more of the following:
 a sending moment of the first signal;   a receiving moment of the first signal;   a sending moment of the second signal; or   a receiving moment of the second signal.   
     
     
         4 . The method according to  claim 3 , wherein the sending moment or the receiving moment is represented by one or more of the following:
 absolute time; or   a first time unit.   
     
     
         5 . The method according to  claim 4 , wherein the first time unit comprises one or more of the following: a frame, a subframe, or an orthogonal frequency division multiplexing (OFDM) symbol. 
     
     
         6 . The method according to  claim 1 , further comprising:
 transmitting, by the first terminal device, the first phase information to a second device.   
     
     
         7 . The method according to  claim 6 , wherein the second device comprises one or more of the following:
 a positioning solving unit;   a positioning server;   a second terminal device serving as a central node; or   a first base station, wherein the first base station comprises at least one of a serving base station or a neighboring base station of the first terminal device.   
     
     
         8 . The method according to  claim 7 , wherein in a case that the first terminal device moves out of a coverage area of the serving base station, the second device comprises the neighboring base station, and the first phase information is transmitted through an uplink grant allocated by the serving base station. 
     
     
         9 . The method according to  claim 8 , wherein the uplink grant allocated by the serving base station is indicated by second information, and the second information is transmitted by the serving base station to the neighboring base station. 
     
     
         10 . The method according to  claim 7 , wherein in a case that the first terminal device moves out of a coverage area of the serving base station, the second device comprises the neighboring base station, and the first phase information is transmitted through a first resource shared by the serving base station and the neighboring base station. 
     
     
         11 . The method according to  claim 10 , wherein the first resource is obtained from a shared resource pool of the serving base station and the neighboring base station in a scheduling-free manner. 
     
     
         12 . The method according to  claim 1 , wherein the first phase information is used to calculate a location of the first terminal device. 
     
     
         13 . The method according to  claim 1 , wherein the first phase information is used to calculate the first location and the second location. 
     
     
         14 . The method according to  claim 13 , wherein the first location and the second location are obtained by calculation based on information about the first device, wherein the information about the first device comprises one or more of the following:
 a running track of the first device;   ephemeris information of the first device;   a moment at which the first device sends the first signal; or   a moment at which the first device sends the second signal.   
     
     
         15 . The method according to  claim 1 , further comprising:
 transmitting, by the first terminal device, third information to a second device, wherein the third information indicates one or more of the following: a relationship between the first phase information and the first signal; or a relationship between the first phase information and the second signal.   
     
     
         16 . The method according to  claim 1 , wherein a transmission interval between the first signal and the second signal is greater than a threshold, and the threshold is related to one or more of the following:
 a transmission delay between the first terminal device and the first device; or   a processing delay of the first terminal device.   
     
     
         17 . The method according to  claim 1 , wherein the first signal comprises a first positioning reference signal (PRS), or the second signal comprises a second PRS. 
     
     
         18 . The method according to  claim 1 , wherein a phase difference  40  between the first signal and the second signal meets: 
       
         
           
             
               Δ∅ 
               = 
               
                 
                   
                     
                       f 
                       2 
                     
                     ⁢ 
                     
                       ∅ 
                       1 
                     
                   
                   
                     f 
                     1 
                   
                 
                 - 
                 
                   
                     ∅ 
                     2 
                   
                   . 
                 
               
             
           
         
         wherein f 1  represents a receiving frequency of the first signal, f 2  represents a receiving frequency of the second signal, Ø 1  represents a phase obtained by the first terminal device measuring the first signal, and Ø 2  represents a phase obtained by the first terminal device measuring the second signal. 
       
     
     
         19 . A wireless communications method, comprising:
 receiving, by a first device, capability information sent by a first terminal device; and   transmitting, by the first device, a first signal and a second signal to the first terminal device, wherein the first signal and the second signal are used to determine first phase information that comprises a phase difference between the first signal and the second signal, a location at which the first device transmits the first signal is a first location, a location at which the first device transmits the second signal is a second location, and the first location is different from the second location, wherein the capability information indicates whether the first terminal device supports calculation of the phase difference between the first signal and the second signal.   
     
     
         20 . A first terminal device, comprises:
 at least one processor; and   one or more non-transitory computer-readable storage media coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions, when executed, cause the first terminal device to perform operations comprising:   transmitting capability information; and   receiving a first signal and a second signal that are sent by a first device, wherein the first signal and the second signal are used to determine first phase information that comprises a phase difference between the first signal and the second signal, a location at which the first device transmits the first signal is a first location, a location at which the first device transmits the second signal is a second location, and the first location is different from the second location, wherein the capability information indicates whether the first terminal device supports calculation of the phase difference between the first signal and the second signal.